Fifths to david a



(No Model.) 2l Sheets-Sheet I.

G. V. BARNES.

ELEVATOR.

No. 590,655. Patented Se t. 28 1897.

' THE mums Farmaco. How-urna. wunmuwu, D. c4

(Nvo Model.)

2 SW E N R A B V.. G.

BLBVATOR.

Patented Sept. 28,1897.

Garne?? i Zai? arzas,

'wsure 25527165565.

- UNITED STATESA PATENT OFFICE.

GARRETT VANZANT BARNES, OF TOPEKA, KANSAS, ASSIGNOR OF TWO- ItIFTI-IS TODAVID A. MULVANE, OF SAME PLACE.

ELEVATOFL SPECIFICATION forming part of Letters Patent No. 590,655,dated September 28, 1897'. Application led December ZZ, 1896. I SerialNo. 616,570. (No model.)

' for maintaining a uniform supply of liquidpressure in anoperating-cylinder of an elevating mechanism 3 and the inventionconsists in the features, combinations, and details of constructionhereinafter described and claimed.

In the accompanying drawings, Figure lis a diagramma-tic view of Vanelevator constructed in accordance with my improvements; Fig. 2,

a diagrammatic view of a portion of the mechanism shown inFig. 1,andFig. 3 a detail perspective View of one ofthe parts hereinafterdescribed.

In the art to which this invention relates it is well known that thetank for supplying liquid-pressure is furnished with a supply of waterby means of a pipe or equivalent mechanism, such as pressure from areservoir at a higher level. This pressure is generally furnishedconstantly, so that the mechanism for furnishing it is in constant use,thereby using up a large supply of electric currentor a supply ofiiuid-pressure for operating the pump. In order to remove this objectionand provide mechanism in connection with the pumpmotor which will throwsuch -motor into action only when necessary'to keep the pressure up to asubstantially uniform point is the principal object of my invention.

In constructing a pump and fitting it with my improvements I make ahydraulic operating-cylinder A of the desired size and shape and provideit with a movable piston having a rod a extending out `of one endthereof. This piston-rod is provided with a rotatable pulley B, so thata wire, cable, or rope b may be passed from the car O around a set ofpulleys c and c and around the pulley B.- In

this way the movements of the pulley on the piston are multiplied, as itwere, and act to move the car at an accelerated speed and thus give itgreater length of movement.

The operating-cylinder is provided with a pressure-supply pipe D, whichconnects with a supply-tank E, located at some suitable point. Suchcylinder is further provided with an exhaust-pipe G, which leads to adriptank g, so that the fluid escaping from the operating-cylinder mayberecovered or retainedlto be again pumped to the supply-tank. At thepoint where the supply and exhaust pipes meet I arrange aY three-wayvalve I-I of such construction and arrangement that when the supply isfurnished the cylinder the eX- haust is closed, and when the supply iscut off from such cylinder the exhaust may be opened. Thethree-wayvalve, or operatingvalve, as I prefer to term it, is provid edwith mechanismpreferably a cable h-which is passed around the pulley onthe three-Way valve and through the car, so that the operator in the carmay move the valve to open or close the same, and thus control themovements of the car when desired.

To furnish the supply-tank with the required amount of water, I providea pump I ofthe desired size and type and connect it by means of afeed-pipe t with the reservoir or drip-tank and by means of aneduct-pipe i with the supply-tank for the operating-cylinder. I furtheruse an electric motor K and connect it with the piston-rod of the pumpby means of a connecting-rod k, to operate such pump whenever desired.

In order to provide current for the motor and supply it at the desiredtimes to operate such motor and pump and keep the pressure uniform inthe supply-tank, I provide an electric circuit, which includes the wire1, rheostat 2, wire 3, source of electric energy 4, cutout switch 5,wire 6, and the .electric motor which furnishes current to the motor andcauses the operation. In order to operate the cut-out switch, so as tomake or break the circuit when the pressure in the supply-tank fallsbelow a certain predetermined point or rises above the same, I providewhat might be termed a hydraulic governing-cylinder L, with a movablepiston Z, having a rod Z eX- ICO tending out at the upper end thereof.This rod is provided with a weight L', located, preferably, at the upperportion, so as to move the piston downwardly when the liquidpressurebelow the same is reduced. Arranged, preferably, parallel with thepistonrod is a second rod or what I prefer to term switch-rod M,provided with an insulated spool m, arranged -to be contacted by afinger Z2 on the piston-rod, so that the finger may strike the innersurface ot either flange and move the switch-rod in the desireddirection. Immediately under or adjacent to the switchrod is the lever 5of the cut-out switch, pivotally mount-ed on a pin 26 and provided witha transverse rod 7, with which it is connected, by means of a spring S,with the switch-rod. It will be seen that as the switch-rod is moved upthe spring 8 is moved up on the transverse rod and acts to pull theswitch-lever over against the stops 9 and lO. Vhen the switchrod ismoved downward, the spring is also moved downward and acts to pull orswing the switch-lever over into contact with the terminals ll and l2 ofthe circuit, thereby closing the circuit and furnishing current to themotor to operate the same, and thereby the pump.

lVhen the parts are made of a workin g size,

the pistonrod of the governing-cylinder will have a relatively largermovement than the switch-rod, so that it is necessary for the iinger topass out of contact with the spool after it has accomplished the resultof opening or closing the switch. In order to accomplish this result, Iprovide one flange of the spool with a slot m and the switch-rod with aprojecting pin m2, arranged to contact angular or cam surfaces N and N.During the rising of the piston-rod the linger passes in through theslot m' and contacts the inner surface of the Lipper iange of the spool.Moving upwardly the pin strikes the inclined surface and turns the rodand spool, and in the return movement of the piston-rod the pin willstrike the inner surface of the lower flange ot the spool and move theswitch downwardly until the pin contacts the lower camsurface M. By thistime the cut-out-switch lever is moved to close the circuit, and thepin, contacting on the cam-surface, rotates the switch-rod and spooluntil the slot is brought coincident with the finger, allowing the sameto pass out and contact the spool without further operating the parts.

In order to furnish pressure to the governing-cylinder, I provide aweighted pistonvalve P, having a movable piston 19 arranged therein,with a valve-rod p extending out of the upper end thereof. A lever P' isarranged to operate on the upper portion of this valverod and isprovided with a weight p2, arranged to be adj ustably located on thelever and provide different degrees of pressure. An eductpipe 193 leadsfrom the valve-chamber to the governing-cylinder, and a discharge-pipe pleads from the valve to the drip-tank g, while a supply-pipe P2 leads toand connects with the pressuresupply pipe,preferabl y at a pointadjacent to the operating-cylinder. The valve operates as follows:Supposingit takes apressure of twenty-five pounds per square inch toeconomically and efficiently operate the elevator, the weight p2 on thevalve-lever is set at such a point as will act to depress the valve whenthe pressure sinks below such point. The moment the valve-piston passesbelow the opening of the eductpipe pressure from the governing-cylinderpasses through such pipe, thro ugh the valve, and out through thedischarge-pipe. This permits the weight to move the governing-pistondownwardly, thereby causing the switch-rod to move downwardly andoperate the cut-out switch to close the circuit of the electric motor tooperate the pump, thereby furnishing a fresh supply of liquid to thesupply-tank. lV hen the pressure in the supply-tank-or, more properlyspeaking, in the pressure-supply pipe--is suficient to operate theelevator economically or rises above twenty-five pounds per square inch,it also acts on the piston of the valve to raise the same and closecommunication between the educt-pipe and discharge, open communicationbetween the pressurepipe and the governing-cylind er to raise the pistontherein, and by the intermediate mechanism operates the cut-out-switchlever to open the electric circuit, thereby stopping the operation ofthe motor and pump.

In supplying current to the motor it is desirable that it be suppliedgradually in order to prevent burning of the insulation in the armature.To accomplish this result, I provide a rheostat 2 of any ordinary type,and which is provided with a pinion 13, engaging with a rack let on thepiston-rod. As the piston-rod moves upwardly to cause the opening of theelectric circuit the rheostat is operated so as to gradually cut oil thecurrent. On the opposite or downward movement of the piston-rod theelectric circuit is closed, as hereinbefore explained, and the rheostatso operated by the rotation of its pinion and shaft as to interpose itsgreatest resistance, so that current is gradually supplied to the motorto bring it to speed gradually, thereby lessening the danger of burningof the parts.

Vhile I have described my invention with more or less minuteness asregards details and as being embodied in certain precise forms, I do notdesire to be limited thereto unduly or any more than is pointed out inthe claims. On the contrary, I contemplate all proper changes in form,construction, and arrangement, the omission of immaterial parts, andsubstitution of equivalents, as circumstances may suggest or necessityrender expedient.

I claiml. In mechanism of the class described, the combination of anelevator or similar mechanism, a cylinder provided with a movable pistonfor4 operating thc elevator, a tank for IOO holding the liquid, apressure-supply pipe connecting the supply-tank with theoperating-cylinder to furnish it a supply of liquid under pressure, anelectrically-actuated pump for supplying liquid to the supply-tank, anelectric circuit embracing the motor of the pump a source of electricenergy and switch, a governing-cylinder connected by meansof a pipe withthe pressure-supply pipe of the operating cylinder, a verticallyweighted movable piston in such governing-cylinder, a switch -rodarranged parallel therewith and adapted to be operated by means of theweighted governing piston-rod, and means connecting the switch-rod withthe switchlever to automatically open and close the electric circuit andthereby control the actions of the pump, substantially as described.

2. In mechanism of the class described, the combination of an elevatoror similar mechanism,'a cylinder provided with a movable piston foroperating the elevator, a tank for holding the liquid, a pressure-supplypipe connecting the supply-tank with the operating-cylinder to furnishit a supply of liquid under pressure,an electrically-actuated pump forsupplying liquid to the supply-tank, an electric circuit embracing themotor of the pu mp a source of electric energy and a switch, agoverning-cylinder connected by means of a pipe with the pressure-supplypipe of the operating-cylinder, a vertically-weighted movable piston insuch governing-cylinder, a switchrod arranged parallel therewith andadapted to be operated by means of the weighted governing piston-rod,means connecting the switch-rod with the switch-lever to automaticallyopen and close the electric circuitand thereby control the actions ofthe pump, and a weighted valve arranged on the pipe intermediate thepressure-supply pipe and the governing-cylinder and adapted to beoperated by pressure in such cylinder and to open and close such pipeand admit pressure to or exhaust pressure from the governingcylinder,substantially as described.

3. Inl mechanism of the class described, the combination of an elevatoror similar mechanism, a cylinder provided with a movable piston foroperating the elevator, a tank for holding a supply of liquid, apressure-supply pipe connecting the supply-tank with theoperating-cylinder to furnish such cylinder a supply of liquid underpressure, an `electricswitch-lever and open and close the electriccircuit by the movements thereof, and means connecting the weightedgoverning piston-rod with the rheostat, whereby current is graduallyturned on to the motor and turned off therefrom, substantially asdescribed.

. 4. In mechanism of the class described, the combination of an elevatoror similar mechanism, a cylinder provided with a movable piston foroperating the elevator, a tank for holding a supply of liquid, a pipeconnecting the supply-tank with the operating-cylinder to furnish suchcylinder a supply of liquid under pressure, an electrically-actuatedpump for furnishing a supply of liquid to the supply-tank, an electriccircuit embracing the motor of the pump a source of electric energy arheostat intermediate the same and a switch, a governing-cylinderconnected with the pressure-supply pipe, a movable piston in suchcylinder provided with a weighted piston-rod arranged in verticalposition, a switch-rod arranged parallel therewith and connected with alever of the electric switch, means arranged on the governing piston-rodto operate the switch-rod and thereby the lever and open and close theelectric circuit, means connecting the weighted governing piston-rodwith the rheostat, whereby current is gradually turned on to the motorand turned off therefrom, and

a weighted piston-valve arranged on the pipek between thegoverning-cylinder and the pressure-supply pipe and adapted to beoperated by the pressure in such pipe to open and close thecommunication with the governing-piston and to admit and exhaustpressure therefrom, substantially as described.

GARRETT VANZANT BARNES.

Vitnesses:

WM. J. FRITZ, Guo. A. URIE.

IOO

